Brake shoe



June 26, 1928. 1,675,291

v. Br-:Nnlx

BRAKE SHOE Filed March 28, 1927 uk ATTORNEY Patented June 26, 1928.

UNITED STATES 1,675,291 PATENT OFFICE.

VINCENT BENDIX, 0F CHICAGO, ILLINOIS, ASSIGNOB T0 BENDIX BRAKE COIPANY, OT

CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

BRAKE SHOE.

Application led Hal-ch 28, 1927. Serial llo. 178,878.

This invention relates to brakes, and is illustrated as embodied in an auxiliary shoe for a three-shoe internal expanding automobile brake. An ob'ect of the invention is to provide a very light shoe, by forming it of a single-thickness web secured to an outer band carrying the lining, this li ht type of construction being made feasible y reinforcing the part lof the web which projects at the end of the shoe as an integral pivot arm, this being the point at which the greatest crushing or buckling strain comes when the brake is applied.

Preferably the reinforcement is in the form of`a separate plate or the like secured to the side of the arm, or a pair of such plates secured to opposite sides of the arm. It will be' seen that by thus reinforcing this particular part of the shoe, excess weight in all the rest of the shoe is avoided, and a ver light but adequately-strong shoe is formed The above and other objects and features of the invention. including various novel and desirable details of construction, will be apparent from the following description of one illustrative embodiment shown in the accompanying dra'wing, in which:

Figure 1 is a side elevation of the shoe;

Figure 2 is a cross-section through the shoe, on the line 2--2 of Figure 1;

Figure 3 is a cross-section through the shoe on the line 3-3 of Figure 1, showing the reinforcing plates;

Figure 4 is a section through the shoe on the line 4 4 of Figure 1, showin the bushing at the end of the shoe whic receives the pivot or anchor for the shoe;

Figure 5 is a partial section through the shoe on the line 5 5 of Figure 1, showing the mounting for the cam-engaging thrust rollers; and

Figure 6 is an inside elevation of the lower end of the shoe, looking in the direction of the arrows 6--6 of Figure 1.

The shoe selected for illustration is the auxiliary shoe of a brake of the neral t e of that fully described in attent o. 1,628,388, granted Bendix Brake Company on Mav 10, 1927, on an application filed by John R. Cautley. It includes generally an outer band or rim 10. to which the brake lining (not shown) may be riveted, and which may have short stiening flanges 12 at its edges, and a separate member 14, forming a central stifenmg web and arc-welded alon its outer edge to the inner face of ban 10.

Web 14 is shown formed with an opening 16 for the anchor of an adjacent shoe, as explained in the above-identified Cautley patent, and is of greater width at this point so that 1t has the same total strength in spite of the opening; it is also shown with an opening 18 for the attachment of a return spring and with an opening 20 for a steady rest. At the u per end of the shoe, web 14 is strengthened) by a pair of plates or stampln s 22 spot-welded to its sides, and 1s provld with cam-engaging rollers 24 mounted on a pivot 26.

The present invention relates to the use of a lig t construction of this general character, whether or not including all of the features described above, in a shoe for a heavy brake, by providing a very strong but light pivot or anchor arm at the end of the shoe, formed by ieinforcin an integral extension 28 of the web 14. he extension 28 is provided at its extreme end with a bushing 30 for the pivot or anchor.

I prefer to reinforce the outer edge of extension 28 by continuing band 10 as a narrowed extension 32 arc-welded or otherwise secured to extension 28, and formed nearly to the end of the shoe with integral wings or flan es 34 bent into engagement with the sides o the extension 28 and, if desired, arcwelded thereto.

The body of extension 28, which is under a heavy buckling strain when the brake is applied, is reinforced by one or more plates 36, two being shown, spot-welded or otherwise secured to the sides of extension 28. Plates 36 extend from adjacent bushin 3() (i. e. from the pivot or anchor of the soe) past the end of the broadened portion of band 10 (which broadened portion forms the friction face of the shoe), thus bridging across the point midway between the anchor and the end of the friction face, which is the oint of maximum bucklin strain.

l ile one illustrative em odiment has been described in detail, it is not my intention to limit the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim:

1. A brake shoe havin an outer cylindrical band providing the riction face of the shoe, and a stiening web projecting inward ly from said band and extending at one end of the shoe as an integral pivot arm, in combination with a separate reinforcing member secured along the side of said arm beyond the end of the friction face, and serving to reinforce the web against bucklin immediately beyond the end of the frictlon face, where the braking pressure is a maximum, without substantially adding to the Weight and cost of the shoe.

2. A brake shoe havin an outer cylindrical band providing the friction face of the shoe, and a separate stiifening web secured along its outer edge to the inner face of the band and projecting inwardly from said band and extending at one end of the shoe as an integral pivot arm, in combination with a separate reinforcing member secured along the side of said arm beyond the end of the friction face, and serving to reinforce the Web against buckling immediately beyond the end of the friction face, where the braking pressure is a maximum, Without substantially adding to the weight and cost of the shoe.

3. A brake shoe having an outer cylindrical band providing the friction face of the shoe, and a stiflening web projecting inwardly from said band and extending at one end of the shoe as an integral pivot arm, in combination with separate reinforcin members secured along the opposite sides o said arm and serving to reinforce the web against buckling immediately beyond the end of the friction face, where the braking pressure is a maximum, Without substantially adding to the Weight and cost of the shoe.

4. A brake shoe having an outer arcuate band, a stiening web secured to the inner face of the band and continued integrally at one end of the shoe to form a projecting arm, a reinforcing plate secured to the side face of said arm, and an integral narrowed extension of said band secured to and reinforcing the outer 'edge of said arm.

5. A brake shoe having an outer arcuate band, a stiifening web secured to the inner face of the band and continued integrally at one end of the shoe to form a pro'ecting arm, a reinforcing plate secured to t e side face of said arm, and an integral narrowed extension of said band secured to and reinforcing the outer edge of said arm, said narrowed extension having one or a pair of side wings engaging one or both sides of said arm.

6. A brake shoe having an outer band, at least part of whch forms a cylindricallycurved friction face for the shoe, in combination with a stifening web extending beyond the end of said ace as a projectin arm, and a separate reinforcement for sai web and arm which crosses from one side to the other of said end of the friction face, and serving to reinforce the web against buckling immediately beyond the end of the friction face, where the braking ressure is a maximum, without substantiay adding to the wei ht and cost of the shoe.

7. A bra e shoe having an outer band, at least part of which forms a cylindricallycurve friction face for the shoe, in combination with a stiffening web extending beyond the end of said face as a projecting arm, and separate reinforcements for opposite sides of said web and arm which cross from one side to the other of said end of the friction face, and serving to reinforce the web against buckling immediately beyond the end of the friction face, where the braking pressure is a maximum, without substantially adding to the Weight and cost of the.slioe.

In testimony whereof, l have hereunto signed my name.

VINCENT BEN DIX. 

